Formula – height from top of floor to top of chair rail = 100mm either side of 2/5 from floor to ceiling height, therefore 2400 divided by 5 = 480mm multiplied by 2 = 940mm. The recommended height of the chair rail from the floor will then be anywhere between 840mm and 1040mm.

The video example shows 970mm.

The video example: 70mm for CR22 chair rail.

Formula = (Measurement established in step 1) MINUS (height/width of skirting plus height/width of chair rail).

Video example: 970mm – (skirting 135mm + chair rail 70mm = 205mm) = 765mm

Cut height stick to this length

Tilt saw over on 45 degrees to perform this bevel cut. This is a 3mm bevel.

Formula = chair rail thickness @ 21mm thick less the architrave thickness @ 18mm = 3 x 3mm bevel cut.

Locate studs with stud finder at chair rail height and mark on the wall.

Position chair rail in place using height stick and fix in place.

Set out wall panels for inlay moulds using 90mm spacers.

Marking all corners: Mark the top right corner of the end wall panel, the bottom right corner of the end wall panel, the top and bottom left corners of the end wall panel, and all 4 external corners for the end wall panels of this overall wall section.

Tack a nail in on the left vertical mark of left-hand end wall panel.

Hook tape measure on nail and measure overall distance of wall panel ends.

Mark out individual wall panels on the wall section.

Recommended individual panel length/width should be 1000mm maximum.

Formula – Overall distance of all panels = 2441mm less (2 @ 90mm spaces = 180mm) = 2261mm, therefore 2261mm divided by 3 panels = 753mm long/wide for each panel.

Video example: This wall section is 2441mm long, so overall will require 3 panels. This means we will need to allow for 2 more 90mm spaces between the 3 wall panels.

Formula = overall distance between top of skirting and underside of chair rail less (2 @ 90mm spaces = 180mm) E.g. 765mm (as in step 3) less 180mm = 585mm

Video example: Wall panel height will be 585mm.

Measure length/width from the vertical mark of the first end wall panel and mark.

Mark the start of the second panel by positioning the 90mm spacer at the vertical mark of the previous wall panel.

Video example: 753mm long/wide x 585mm high

Video example: The overall length of the long points for the vertical inlay mould components = 585mm as determined in step 21. The overall length of the long points for the horizontal inlay mould components = 753mm as determined in step 16.

You will require 2 vertical and 2 horizontal pieces of inlay mould to create each rectangular panel on the wall.

Video example: this wall section requires 3 wall panels, therefore 3 wall panels x 2 vertical inlay moulds/panel = 6 pieces of inlay mould @ 585mm long, and 3 wall panels x 2 horizontal inlay moulds/panel = 6 pieces of inlay mould @ 753mm long.

Intrim TIP: The original vertical inlay mould cut (to 585mm long in our video example), should be the same throughout the project as long as the distance between the top of the skirting and the underside of the chair rail is consistent throughout.

Intrim TIP: The original horizontal inlay mould cut to length will be the same for that particular wall section length only. These lengths will need to be adjusted to suit each individual wall section length.

Begin installing inlay moulds to form rectangular wall panels using the 90mm spacers.

Place glue on the back face of a piece of vertical inlay mould and the back face of a piece of horizontal inlay mould. Position the 2 @ 90mm spacers in the corner and nail both inlay moulds in place to form the first corner of the wall panel. Use short nails and fix nails at a slight angle to gain more holding power to plaster while the glue dries.

Continue to fix the next wall panel using 90mm spacers, repeating the steps from above.

Fix the final wall panel for this section of wall using 90mm spacers, repeating steps from above.

Completed wainscoting panels on the section of wall. Ready for painting.